(b) not change the Approved Maintenance Program without all
 necessary approvals from the Air Authority; provided, however,
 that if any such

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 change adversely affects the interests of Lessor with respect
 to the maintenance status of the Aircraft (or payments in
 respect of such status) required pursuant to the provisions of
 Clause 12 and Schedule 3 of this Agreement, then the
 requirements of such provisions shall be deemed adjusted so
 that the maintenance condition of the Aircraft at redelivery
 required thereby is not diminished, and the payments to or by
 Lessor are not adversely changed from the maintenance
 condition and payments that would have been required in the
 absence of such change to the Approved Maintenance Program;

 (c) provide Lessor with a summary of, access to and information
 regarding substantial changes to the Approved Maintenance
 Program;

 (d) maintain the Aircraft in accordance with the Approved
 Maintenance Program through an Agreed Maintenance Performer;

 (e) maintain the Aircraft in accordance with the rules and
 regulations of the Air Authority applicable to the Aircraft;

 (f) comply (or cause compliance) with all Mandatory Orders and
 Airworthiness Directives and similar mandatory requirements
 applicable to the Aircraft, any Engine or Part having a
 compliance date during the Term or existing as of the Final
 Expiry Date and having a compliance date within 180 days after
 the Final Expiry Date and which are required by the Air
 Authority or the FAA (provided that in relation to
 Airworthiness Directives Lessor and Lessee agree to the cost
 sharing formula set out in Schedule 11);